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SubjectRe: Direct access to hardware
On Tue, 25 Jul 2000, Horst von Brand wrote:

> James Sutherland <jas88@cam.ac.uk> said:
> > On Sun, 23 Jul 2000, Horst von Brand wrote:
>
> [...]
>
> > > Yep. It should also carefully check that those damn ELF thingies being
> > > thrown at the CPU better contain valid code!
>
> > It does. How do you think the kernel works around CPU bugs - replicate
> > nanites to rewire the CPU?
>
> Please show me where Linux checks every byte of an executable before
> running it to make sure it doesn't f00f or coma your CPU.

Inside the CPU, in hardware. If you attempt to execute invalid code, Linux
knows about it straight away.


James.


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